参数资料
型号: PIC16C621-20/SS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PDSO20
封装: 0.209 INCH, PLASTIC, MO-150, SSOP-20
文件页数: 83/121页
文件大小: 1202K
代理商: PIC16C621-20/SS
PIC16C62X
DS30235H-page 64
1999 Microchip Technology Inc.
BCF
Bit Clear f
Syntax:
[
label ] BCF
f,b
Operands:
0
≤ f ≤ 127
0
≤ b ≤ 7
Operation:
0
→ (f<b>)
Status Affected:
None
Encoding:
01
00bb
bfff
ffff
Description:
Bit ’b’ in register ’f’ is cleared.
Words:
1
Cycles:
1
Example
BCF
FLAG_REG, 7
Before Instruction
FLAG_REG = 0xC7
After Instruction
FLAG_REG = 0x47
BSF
Bit Set f
Syntax:
[
label ] BSF
f,b
Operands:
0
≤ f ≤ 127
0
≤ b ≤ 7
Operation:
1
→ (f<b>)
Status Affected:
None
Encoding:
01
01bb
bfff
ffff
Description:
Bit ’b’ in register ’f’ is set.
Words:
1
Cycles:
1
Example
BSF
FLAG_REG,
7
Before Instruction
FLAG_REG = 0x0A
After Instruction
FLAG_REG = 0x8A
BTFSC
Bit Test, Skip if Clear
Syntax:
[
label ] BTFSC f,b
Operands:
0
≤ f ≤ 127
0
≤ b ≤ 7
Operation:
skip if (f<b>) = 0
Status Affected:
None
Encoding:
01
10bb
bfff
ffff
Description:
If bit ’b’ in register ’f’ is ’0’, then the
next instruction is skipped.
If bit ’b’ is ’0’, then the next instruc-
tion fetched during the current
instruction execution is discarded,
and a NOP is executed instead,
making this a two-cycle instruction.
Words:
1
Cycles:
1(2)
Example
HERE
FALSE
TRUE
BTFSC
GOTO
FLAG,1
PROCESS_CO
DE
Before Instruction
PC =
address
HERE
After Instruction
if FLAG<1> = 0,
PC =
address TRUE
if FLAG<1>=1,
PC =
address FALSE
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